Mouse Pointer

Hi. A strange thing happened today. My mouse pointer has changed. Anywhere outside of Dorico it is normal. Within dorico it changes to a bar with an arrow head on either end.
I have not seen this before. Everything is working as before but is now very slow.
Any ideas?
This started when I opened a new project when I opened a midi file into Dorico.

Thanks

I believe there was another report of this recently.

Could you have Insert mode activated?

Indeed, see this earlier thread:

I suspect you will find that if you close and reopen the project, the cursor will revert to its usual shape.

Two or three tries later, it cleared. It’s all good now.

Thanks everyone for your advice.
After 2 days it has disappeared.
Maybe it just needed a rest…
Now back to normal.